I don’t think it’s circular as things become pervasive not because of slippery slope of just a few cameras and then adding more, but because the tech in those cameras became cheap from other trends.
In that cameras aren’t cheap inherently, but because chips and storage and power are so cheap it leads to cheap cameras. So people chose all of the other non-camera functions that also led to cheap camera.
For dna, I wouldn’t be a fan of just gradually adding dna identifying machines until it’s pervasive. I’d like to not do that. But what I mean is that dna sequencing will become so cheap due to other factors that it will be pervasive to just add id machines to air conditioners or whatever.
That’s circular reasoning. It is all the more reason to oppose this crap today so it does not become pervasive. Think of anything that you don’t like but is pervasive. Don’t you wish the people that came before you would have opposed that a bit harder so you don’t have to deal with it now?
The noninvasive part of your argument does matter, but I feel that’s much harder to define as everyone will draw the line somewhere different.